Regal Rexnord Thomas XTSR Series Manual

1
F O R M
Thomas®XTSR71 Installation and
Maintenance Manual • Sizes 494-5258
CP3-001E
Revised
June 2023
Industrial Powertrain Solutions
Regal Rexnord
Application Engineering: 800 626 2093
[e-mail]
rexnord.com/couplings
Indicates a hazard which, if not avoided, will result in
serious injury or death.
Indicates a hazard which, if not avoided, could result
in minor or moderate personal injury.
Indicates a hazard which, if not avoided, could result
in serious injury or death.
Indicates information considered important, but not hazard-
related (e.g. messages relating to property damage).
© 2013, 2023 Regal Rexnord Corporation, All Rights Reserved. MCIM23014E • Form# CP3-001E
• The coupling should be stored in a dry corrosion protected
environment, free from external loads (for example by stacking) to
prevent damage which may cause a hazard when the coupling is put
into service.
• For ATEX requirements the guard must have a minimum of 12.7 mm
(1/2 in) radial clearance to the coupling outside diameter and allow for
proper ventilation.
• All conductive parts of the equipment should be connected in such
a way that hazardous electrical potential differences cannot occur. In
case insulated metal parts could be charged thus becoming a potential
ignition source, earth connections must be provided.
• All work on the coupling must be performed when the coupling is at
rest with no load.
• Do not start or jog the motor, engine, or drive system without securing
the coupling components. If the equipment is started with only a hub
attached, the hub must be properly mounted and ready for operation,
with the key and set screw (if included) fastened. When the full
coupling assembly is started, all fasteners and hardware must be
completely and properly secured. Do not run the coupling with loose
fasteners.
• Use explosive environment appropriate tools only, for more information
see DIN EN 1127-1:2008:02, Annex A.
• The coupling may only be used in accordance with the technical data
provided in the Thomas disc coupling catalog. Customer modifications
and alterations to the coupling are not permissible.
• Safety should be a primary concern in all aspects of coupling
installation, operation, and maintenance.
• Proper lockout/tagout procedures must be followed to safeguard
against unintentional starting of the equipment.
• Make sure to disengage the electrical power and any other sources
of potential energy before you perform work on the coupling.
• Do not make contact with the coupling when it is rotating and/or in
operation.
• Because of the possible danger to person(s) or property from
accidents which may result from improper use or installation of these
products, it is extremely important to follow the proper selection,
installation, maintenance and operational procedures.
• Installation should be carried out by skilled personnel only.
All personnel involved in the installation, service, operation,
maintenance, and repair of this coupling and the connected
equipment must read, understand, and comply with these
Installation and Maintenance instructions. The Installation and
Maintenance instructions and assembly drawing, if provided, must
be at hand at the installation site.
• Packaging material can generate electrostatic charges. It may then
become an explosive hazard. It must be removed from the coupling
outside any hazardous areas.
• All rotating power transmission products are potentially dangerous
and can cause serious injury. They must be properly guarded in
compliance with OSHA, ANSI, ATEX, European machine safety
standards and other local standards. It is the responsibility of the
user to provide proper guarding.
• For this coupling to meet the ATEX requirements, you must precisely
follow these installation and maintenance instructions, and the
supplement form 0005-08-49-01. This supplement outlines the ATEX
requirements. If the operator does not follow these instructions, the
coupling will immediately be considered non-conforming to ATEX.
GENERAL SAFETY INSTRUCTIONS
• All spare parts for service or replacement must originate from or be
approved by Rexnord.

2© 2013, 2023 Regal Rexnord Corporation, All Rights Reserved. MCIM23014E • Form# CP3-001E
Type XTSR71
Sizes 494-5258
Figure 1 – Thomas XTSR71 Coupling
1. General Information
1.1 Rexnord®Thomas®Couplings are designed to provide a
mechanical connection between the rotating shafts of
mechanical equipment, using flexible discs to accommodate
inherent misalignment while transmitting the power and
torque between the connected shafts.
1.2 These instructions are intended to help you to install and
maintain your Rexnord Thomas coupling. Please read these
instructions prior to installing the coupling, and prior to
maintenance of the coupling and connected equipment.
Keep these instructions near the coupling installation and
available for review by maintenance personnel. For special
engineered couplings, Rexnord may provide an engineering
drawing containing installation instructions that take
precedence over this document.
1.3 Rexnord owns the copyright of this material. These
Installation and Maintenance instructions may not be
reproduced in whole or in part for competitive purposes.
PRECAUTION
For this coupling to meet the ATEX requirements, you must
precisely follow these installation and maintenance instructions,
and the supplement form 0005-08-49-01. This supplement
outlines the ATEX requirements. If the operator does not follow
these instructions, the coupling will immediately be considered
non-conforming to ATEX.

3
© 2013, 2023 Regal Rexnord Corporation, All Rights Reserved. MCIM23014E • Form# CP3-001E
Figure 3 – Disc Pack Hardware Kit
Consisting of parts 1, 3and 4above.
Thomas XTSR71 couplings are delivered from the factory with a
fully assembled center member consisting of a center spool, two
adapters, disc packs, bolts, bushings and locknuts that have
already been tightened at the factory to the torque specified in
Table 5. The center member assembly is ready for field installation
and it is recommended that you do not disassemble it unless you
are replacing the disc packs. Cap screws will need to be installed
and tightened during installation.
12
Figure 2 – Thomas®XTSR71 Coupling Components
Note:Coupling component numbers above correspond to the component numbers in the column headers of Table 1.
2
85
317
4
10
Cap Screws

4© 2013, 2023 Regal Rexnord Corporation, All Rights Reserved. MCIM23014E • Form# CP3-001E
XTSR71
Coupling
Size
Standard
Hub + Cap
Screw Kit
8
Part No.**
XL Hub +
Cap Screw
Kit Part No.
Standard
Adapter
10
Part No.
(2 per
coupling)
XL
Adapter
XXL
Adapter
Center Spool (1 per Coupling) 2Disc Pack
2 per
Coupling
Part No.
5
Hardware Kit (Bolts, Locknuts, and Overload
Bushings) for One Disc Pack 12
Part No.
“C”
Length
(in)
Part No.
“C”
Length
(mm)
Hardware
Kit Part
No.*
Bolts
Quantity
4
Locknuts
Quantity
1
Bushings
Quantity
3
10003235 3.50 10003238 100
494 10611141 10611142 10003755 10003215 10003216 10003236 3.75 10003239 140 10003753 10611144 4 4 4
10003237 5.00 --- ---
10003240 3.50 10003243 100
644 10611142 --- 10003754 --- 10003218 10003241 3.75 10003244 140 10002803 10611145 4 4 4
10003242 5.00 --- ---
10001131 10001781 10002805
10000871 3.50 10000801 100
10000091 10001561 6 6 6726 10001611 10001612 10311913 3.75 10000860 140
10000872 4.38 --- ---
10000873 5.00 --- ---
10001132 10001782 10002806
10355817 3.50 10000802 100
10000092 10001562 6 6 6826 10001612 10001613 10319474 3.75 10000861 140
10000875 4.38 --- ---
10000876 5.00 --- ---
10001133 10001783 10002807
10613540 3.75 10000862 100
10000093 10001563 6 6 6
10000877 4.38 10000803 140
996 10001613 10001614 10000878 5.00 --- ---
10000879 7.00 10000863 180
1088 10001614 10001615 10001134 10001784 10002808 10000880 5.00 10000804 140 10000094 10001564 8 8 8
10000881 7.00 10000864 180
1298 10001615 10001616 10001135 10001785 10002809
10000882 5.00 10000805 140
10000095 10001565 8 8 810000883 7.00 10000865 180
--- --- --- 250
1548 10001616 10001617 10001136 10001786 10002810 10000885
--- 10000866 140
10000096 10001566 8 8 87.00 10000806 180
--- 10000867 250
1698 10001617 10001618 10001137 10001787 10002811 10000886 7.00 10000807 180 10000097 10001567 8 8 8
--- --- 10000868 250
1928 10001618 10001619 10001138 10001788 10002812
10000887 7.00 10000808 180
10000098 10001568 8 8 810000888 7.50 10000869 250
10000889 8.00 --- ---
2068 10001619 10001620 10001139 10001789 10002813 10000891 8.00 10000809 250 10000099 10001569 8 8 8
2278 10001620 10001621 10001140 10001790 10002814 10000892 8.00 10000810 250 10000100 10001570 8 8 8
2468 10001621 10001622 10001141 10001791 10002815 10000893 9.00 10000811 250 10000101 10001571 8 8 8
2698 10001622 10001623 10001142 10001792 10002816 --- --- 10000812 250 10000102 10001572 8 8 8
2888 10001623 10001624 10001143 10001793 10002817 --- --- --- --- 10000103 10001573 8 8 8
3058 10001624 10001631 10001144 10001794 10002818 --- --- --- --- 10000104 10001574 8 8 8
3358 10001631 10001625 10001145 10001795 10002819 --- --- --- --- 10000105 10001575 8 8 8
3668 10001625 10001626 10001146 10001796 10002820 --- --- --- --- 10000106 10001576 8 8 8
3908 10001626 10001627 10001147 10001797 10002821 --- --- --- --- 10000107 10001577 8 8 8
4178 10001627 10001628 10001148 10001798 10002822 --- --- --- --- 10000108 10001578 8 8 8
4588 10001628 10001629 10001149 10001799 10002823 --- --- --- --- 10000109 10001579 8 8 8
4918 10001629 10001630 10001150 10001800 --- --- --- --- --- 10000110 10001580 8 8 8
5258 10001630 --- 10001151 --- --- --- --- --- --- 10000111 10001581 8 8 8
*Disc pack hardware sold as kits only.
**All hub part numbers are non bored and include adapter hub hardware kit.
Table 1 — Rexnord®Thomas®XTSR71 Coupling Component Part Numbers
Note: the circled numbers identified in the column headers below, correspond to the coupling component numbers in Figures 2 and 3.

5
© 2013, 2023 Regal Rexnord Corporation, All Rights Reserved. MCIM23014E • Form# CP3-001E
2. Hub Mounting
WARNING! Be sure to disengage the electrical power and any
other sources of potential energy before you perform work on the
hub and coupling assembly.
2.1 Examine the coupling assembly to assure there is no visible
damage.
2.2 Clean the hub bores and shafts using lint-free cloth. Remove
any nicks or burrs.
2.3 The key(s) should have a close side-to-side fit in the keyway
in the hub and shaft, with a slight clearance over the top
when assembled
Figure 4 – Mounting Hubs on Shafts
2.4 Remove the cap screws that attach the hubs to the
adapters, and remove both hubs.
CAUTION! When heating hubs is required, an oven is
preferred and an open flame is not recommended. If flame
heating is considered mandatory, it is important to provide
uniform heating to avoid distortion and excessive
temperature. A thermal stick applied to the hub surface will
help determine the hub temperature.
CAUTION! Touching hot hubs causes burns. Wear safety
gloves to avoid contact with hot surfaces.
3. Straight Bore with Clearance/Slip Fit
3.1 Install the key(s) in the shaft.
3.2 Check to be sure that the set screw(s) in the hub does not
protrude into the keyway or the bore. Remove or back out
the set screw to provide clearance during assembly.
3.3 Slide the hub up the shaft to the desired axial position.
3.4 If used; assemble and tighten the set screw(s) using a
calibrated torque wrench to the values shown in Table 2.
Table 2 — Set ScrewTightening Torque
CAUTION! Never use two set screws with one on top of the other in the same tapped hole.
Set Screw Units – METRIC
Set Screw Size M3 M4 M5 M6 M8 M10 M12 M16 M20 M24
Hex Head Key Size 1.5 2 4 3 4 5 6 8 10 12
Tightening
Torque
(Nm) 0.8 2 3 6 12 25 50 100 206 379
(lb-in) 7 17 30 55 110 220 440 880 1,827 3,358
Set Screw Units – INCH
Set Screw Size #6-40 #8-32 NF #10-32 NF 1/4-28 NF 5/16-24 NF 3/8-24 NF 1/2-20 NF 5/8-11 NC 3/4-10 NC 7/8-9 NC 1.00-8 NC
Hex Head Key Size 1/16 5/64 3/32 1/8 5/32 3/16 1/4 5/16 3/8 1/2 9/16
Tightening
Torque
(Nm) 1 2 4 9 16 31 75 120 217 325 452
(lb-in) 9 17 31 76 144 276 660 1,060 1,920 2,880 4,000

6© 2013, 2023 Regal Rexnord Corporation, All Rights Reserved. MCIM23014E • Form# CP3-001E
4. Straight Bore with Interference Fit
4.1 Accurately measure the bore and shaft diameters to assure
proper fit.
4.2 Install the key(s) in the shaft.
4.3 Heat the hub in an oven until the bore is sufficiently larger
than the shaft. 350°F (177°C) is usually sufficient for
carbon steel hubs. Do not exceed 500°F (260°C).
4.4 With the hub expanded, install it quickly on the shaft to
the desired axial position. A pre-set axial stop device can
be helpful.
Figure 5 – Shaft end to hub
face measurement example
Figure 6 – Dial indicator placement for
axial draw measurement example
5. Taper Bore
5.1 Check for acceptable contact pattern between the hub and
the shaft.
5.2 Put the hub on the shaft, keeping the keyways (if existing)
aligned.
5.3 Lightly tap the face of the hub with a soft mallet. The
resultant position will provide a starting point for the hub
axial draw up.
5.4 Use a depth micrometer to measure the distance from the
shaft end to the hub face, as shown in Figure 5. Record the
dimension.
5.5 Mount a dial indicator to read axial hub advancement, as
shown in Figure 6. Alternatively, the indicator can be
positioned to contact the end of the hub. Set the indicator
to “zero.”
5.6 Remove the hub and install the key(s) in the shaft.
5.7 Heat the hub in an oven until the bore is sufficiently larger
than the shaft. 350°F (177°C) is usually sufficient for carbon
steel hubs. Do not exceed 500°F (260°C).
5.8 Higher temperatures may be required for higher
interference fit levels where alloy steel hubs may be
encountered. A general rule to consider is that for every
160°F increase in temperature, steel will expand 0.001 inch
for every inch of shaft diameter (or 0.029 mm/100°C). When
calculating temperatures, also consider additional expansion
to provide clearance and allow for a loss of heat and
subsequent shrinkage during the handling process.
5.9 With the hub expanded, install it quickly on the shaft to the
“zero” set point. Continue to advance the hub up the taper
to the desired axial position, as defined by Regal Rexnord’s
customer. Use the indicator as a guide only. A pre-set axial
stop device can be helpful.
5.10 Inspect the assembly to verify that the hub is properly
positioned. Consult Regal Rexnord if necessary.
5.11 Install any hub axial retention device (if any) in accordance
with the equipment manufacturer’s specifications.

7
© 2013, 2023 Regal Rexnord Corporation, All Rights Reserved. MCIM23014E • Form# CP3-001E
6. Shaft Alignment
NOTICE Soft foot – the equipment must rest flat on its base. If
one or more feet of the machine are shorter, longer, or angled in
some way to prevent uniform contact (a condition commonly
known as “soft foot”) it must now be corrected.
NOTICE To improve the life of the coupling, the shafts must be
aligned to minimize distortion of the flexing elements. Shaft
alignment is required in the axial, parallel, and angular directions,
with each of these values not to exceed the recommended
ratings for the coupling and the alignment values shown in Table 3.
Shaft alignment can be measured using various established
methods, including Laser Alignment, Reverse Dial Indicator, and
Rim and Face.
Move the connected equipment to achieve acceptable alignment.
When well aligned, the disc packs will be centered and
approximately parallel to their mating flange faces and the flexing
elements will have little visible waviness when viewed from the
side.
As a guide, the maximum and minimum values for dimension
“N” shown in Figure 7 are given in Table 3. These dimensions are
suggested for initial installation. Additional capacity is available to
compensate for thermal and structural equipment movement.
Maximum axial capacity values for these couplings are also given
in Table 3.
Table 3 shows installation limits for Angular and Parallel
alignment. The Angular Alignment Total Indicator Reading value is
the maximum difference between the measurements (X-Y) taken
between opposite sides of the center spool flange and adapter
flange as shown in Figure 8. The Parallel Alignment value “P” is
the offset between the centers of the hubs, as shown in Figure
9. If parallel offset is measured by rotating the hubs with a dial
indicator on the outside diameter, the total indicated reading
should be divided by (2) to calculate “P”.
Figure 7 – Disc Gap N
Figure 9 – Parallel Misalignment
P
P
Figure 8 – Angular Misalignment
Y
X

8© 2013, 2023 Regal Rexnord Corporation, All Rights Reserved. MCIM23014E • Form# CP3-001E
Table 3 — Alignment Values
XTSR
71
Size
“A”
Dimension
“A”
Dimension
“N”
Dimension “C” Length
(distance
between hub
flanges)
Installation
Axial Limits
+/-
Axial
Capacity
+/-
Recommended Installation Limits***
Parallel Misalignment Angular
Misalignment
Between Hubs
Installation
(X-Y)
Standard Hub
Angular
Misalignment
Between Hubs
Installation
(X-Y)
XL Hub
Parallel
Alignment Total
Indicator Read-
ing (TIR*)
Installation
Limit Parallel
Offset
“P”**
Std. Hub XL Hub Min. Max. Min. Max.
(in) (mm) (in) (mm) (in) (in) (mm) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm)
494 2.77 70.0 3.36 85.0 0.33 0.35 8.3 8.8
3.50 88.9
0.012 0.30 0.045 1.2
0.035 0.89 0.018 0.44
0.004 0.10 0.004 0.10
3.75 95.3 0.038 0.95 0.019 0.48
5.00 127.0 0.050 1.27 0.025 0.64
3.94 100.0 0.039 1.00 0.020 0.50
5.51 140.0 0.055 1.40 0.028 0.70
644 3.36 85.0 --- --- 0.33 0.35 8.3 8.8
3.50 88.9
0.017 0.43 0.068 1.7
0.035 0.89 0.018 0.44
0.004 0.10 --- ---
3.75 95.3 0.038 0.95 0.019 0.48
5.00 127.0 0.050 1.27 0.025 0.64
3.94 100.0 0.039 1.00 0.020 0.50
5.51 140.0 0.055 1.40 0.028 0.70
726 3.74 95.0 4.25 108.0 0.33 0.35 8.3 8.8
3.50 88.9
0.026 0.65 0.051 1.3
0.028 0.71 0.014 0.36
0.005 0.13 0.006 0.15
3.75 95.3 0.030 0.76 0.015 0.38
4.38 111.1 0.035 0.89 0.018 0.44
5.00 127.0 0.040 1.02 0.020 0.51
3.94 100.0 0.031 0.80 0.016 0.40
5.51 140.0 0.044 1.12 0.022 0.56
826 4.25 108.0 5.08 129.0 0.36 0.38 9.1 9.6
3.50 88.9
0.030 0.75 0.059 1.5
0.028 0.71 0.014 0.36
0.006 0.15 0.007 0.18
3.75 95.3 0.030 0.76 0.015 0.38
4.38 111.1 0.035 0.89 0.018 0.44
5.00 127.0 0.040 1.02 0.020 0.51
3.94 100.0 0.031 0.80 0.016 0.40
5.51 140.0 0.044 1.12 0.022 0.56
996 5.08 129.0 5.51 140.0 0.37 0.39 9.3 9.9
3.75 95.3
0.035 0.90 0.070 1.8
0.030 0.76 0.015 0.38
0.007 0.18 0.008 0.20
4.38 111.3 0.035 0.89 0.018 0.45
5.00 127.0 0.040 1.02 0.020 0.51
7.00 177.8 0.056 1.42 0.028 0.71
3.94 100.0 0.031 0.80 0.016 0.40
5.51 140.0 0.044 1.12 0.022 0.56
7.09 180.0 0.057 1.44 0.028 0.72
1088 5.51 140.0 6.54 166.0 0.40 0.42 10.1 10.7
5.00 127.0
0.025 0.65 0.051 1.3
0.020 0.51 0.010 0.25
0.005 0.13 0.006 0.15
7.00 177.8 0.028 0.71 0.014 0.36
5.51 140.0 0.022 0.56 0.011 0.28
7.09 180.0 0.028 0.72 0.014 0.36
1298 6.54 166.0 7.83 199.0 0.50 0.52 12.6 13.3
5.00 127.0
0.031 0.80 0.061 1.6
0.020 0.51 0.010 0.25
0.006 0.15 0.008 0.20
7.00 177.8 0.028 0.71 0.014 0.36
5.51 140.0 0.022 0.56 0.011 0.28
7.09 180.0 0.028 0.72 0.014 0.36
9.84 250.0 0.039 1.00 0.020 0.50
1548 7.83 199.0 8.66 220.0 0.57 0.59 14.4 5.1
7.00 177.8
0.037 0.90 0.073 1.8
0.028 0.71 0.014 0.36
0.008 0.20 0.008 0.20
5.51 140.0 0.022 0.56 0.011 0.28
7.09 180.0 0.028 0.72 0.014 0.36
9.84 250.0 0.039 1.00 0.020 0.50
1698 8.66 220.0 9.66 245.4 0.61 0.64 15.4 16.2
7.00 177.8
0.040 1.00 0.080 2.0
0.028 0.71 0.014 0.36
0.008 0.20 0.009 0.237.09 180.0 0.028 0.72 0.014 0.36
9.84 250.0 0.039 1.00 0.020 0.50
1928 9.66 245.4 10.39 264.0 0.66 0.69 16.7 17.4
7.00 177.8
0.046 1.15 0.091 2.3
0.028 0.71 0.014 0.36
0.009 0.23 0.010 0.25
7.50 190.5 0.030 0.76 0.015 0.38
8.00 203.2 0.032 0.81 0.016 0.41
7.09 180.0 0.028 0.72 0.014 0.36
9.84 250.0 0.039 1.00 0.020 0.50
2068 10.39 264.0 11.44 290.5 0.71 0.74 18.0 18.8 8.00 203.2 0.049 1.25 0.097 2.5 0.032 0.81 0.016 0.41 0.010 0.25 0.011 0.28
9.84 250.0 0.039 1.00 0.020 0.50
2278 11.44 290.5 12.32 313.0 0.74 0.77 18.8 19.5 8.00 203.2 0.054 1.35 0.107 2.7 0.032 0.81 0.016 0.41 0.011 0.28 0.012 0.30
9.84 250.0 0.039 1.00 0.020 0.50
2468 12.32 313.0 13.58 345.0 0.79 0.82 20.1 20.8 9.00 228.6 0.058 1.50 0.116 3.0 0.036 0.91 0.018 0.46 0.012 0.30 0.013 0.33
9.84 250.0 0.039 1.00 0.020 0.50
2698 13.58 345.0 15.00 381.0 0.91 0.94 23.0 23.9 9.84 250.0 0.064 1.60 0.127 3.2 0.039 1.00 0.020 0.50 0.013 0.33 0.014 0.36
2888 15.00 381.0 15.94 405.0 0.97 1.00 24.7 25.4 12.00 304.8 0.068 1.75 0.136 3.5 0.048 1.22 0.024 0.61 0.014 0.36 0.015 0.38
3058 15.94 405.0 17.20 437.0 0.97 1.01 24.7 25.6 12.00 304.8 0.072 1.85 0.144 3.7 0.048 1.22 0.024 0.61 0.015 0.38 0.017 0.43
3358 17.20 437.0 18.98 482.0 1.06 1.09 27.0 27.7 12.00 304.8 0.079 2.00 0.158 4.0 0.048 1.22 0.024 0.61 0.017 0.43 0.018 0.46
3668 18.98 482.0 19.80 503.0 1.18 1.21 29.9 30.8 15.00 381.0 0.087 2.20 0.173 4.4 0.060 1.52 0.030 0.76 0.018 0.46 0.019 0.48
3908 19.80 503.0 20.83 529.0 1.18 1.21 29.9 30.8 15.00 381.0 0.093 2.35 0.185 4.7 0.060 1.52 0.030 0.76 0.019 0.48 0.020 0.51
4178 20.83 529.0 23.94 608.0 1.25 1.30 31.9 33.0 15.00 381.0 0.099 2.50 0.197 5.0 0.060 1.52 0.030 0.76 0.020 0.51 0.023 0.58
4588 23.94 608.0 25.51 648.0 1.40 1.43 35.5 36.4 18.00 457.2 0.108 2.75 0.216 5.5 0.072 1.83 0.036 0.91 0.023 0.58 0.024 0.61
4918 25.51 648.0 26.69 678.0 1.48 1.52 37.6 38.6 18.00 457.2 0.116 2.95 0.232 5.9 0.072 1.83 0.036 0.91 0.024 0.61 0.026 0.66
5258 26.69 678.0 --- --- 1.56 1.61 39.7 40.8 18.00 457.2 0.124 3.15 0.248 6.3 0.072 1.83 0.036 0.91 0.026 0.66 --- ---
* Parallel misalignment measured by rotating the hubs with a dial indicator on the outside hub diameter will result in a maximum TIR.
For sizes 494-644 use 0.010 inch per inch of “C” dimension (or 0.010 mm per mm of “C” dimension) for non-standard “C” dimensions. Multiply “C” x 0.010 to calculate the TIR.
For sizes 726-996 use 0.008 inch per inch of “C” dimension (or 0.008 mm per mm of “C” dimension) for non-standard “C” dimensions. Multiply “C” x 0.008 to calculate the TIR.
For sizes 1088-5258 use 0.004 inch per inch of “C” dimension (or 0.004 mm per mm of “C” dimension) for non-standard “C” dimensions. Multiply “C” x 0.004 to calculate the TIR.
** Parallel offset “P” is equivalent to one-half of the TIR measurement using dial indicators.
*** During installation and/or operation, do not exceed the maximum misalignment capacity of coupling.
For sizes 494-644 maximum misalignment capacity of coupling is 2/3º per disc pack.
For sizes 726-996 maximum misalignment capacity of coupling is 1/2º per disc pack.
For sizes 1088-5258 maximum misalignment capacity of coupling is 1/3º per disc pack.
Note: 1. Refer to Rexnord®Bulletin 538-214 Coupling Alignment Fundamentals for more details regarding alignment methods and procedures.
a. The Angular Misalignment value is the maximum difference between the measurements X and Y taken at opposite ends of the hub flanges, as shown in Figure 8.
b. The Parallel Misalignment value “P” is the offset between the centers of the hubs, as shown in Figure 9.

9
© 2013, 2023 Regal Rexnord Corporation, All Rights Reserved. MCIM23014E • Form# CP3-001E
7. Final Assembly
Note: XTSR71 couplings are delivered from the factory with a
fully assembled center member subassembly with locknuts
tightened at the factory to the torque specified in Table 5. The
center member subassembly is ready for field installation, and we
recommend that you do not disassemble it (unless you are
replacing the disc packs).
Verify that the hubs have been mounted as shown in Figure 4, to
provide the correct “C” length (defined in Table 1). The “C”
length is the distance measured between the faces of the two
hub flanges.
Due to the hub-to-adapter piloting feature, the center member
subassembly must be compressed to allow it to be slipped
between the two end hubs.
Use the hub to adapter cap screws (provided) as defined in
Figure 2 and Table 4 to compress the center member assembly
by inserting them through the holes in the flanges of the center
spool and threading them into the adapter tapped holes as shown
in Figure 10.
Spacer
Adapter
Compression
Cap Screw
Unitized Disc Pack
Figure 10
Note: Tighten the cap screws equally to compress both ends
only enough to allow the center member subassembly to fit
between the hubs (do not tighten more than necessary to provide
clearance for assembly).
7.1 Make sure that the adapter and the hub flange face and
pilots are free from foreign material, nicks and burrs to allow
for proper pilot seating.
7.2 Place the compressed center member between the
coupling hubs, lining up the tapped holes in the adapter
with the cap screw clearance holes in the hub. If the
coupling was assembly balanced, also align any match
marks.
7.3 Remove the cap screws from the spacer flange to adapter,
allowing the hub outside diameter to make contact with the
pilot diameter of the adapter.
7.4 Lubricate the cap screw threads and insert the cap screws
through the hub flange clearance holes and into the mating
threaded holes in the adapter. Tighten each cap screw to the
torque as listed in Table 4.
For further help with the installation or alignment consult Regal
Rexnord.
NOTICE All bolts and cap screw threads must be lubricated prior
to assembly. A clean motor oil is recommended. Do not use
lubricants containing molybdenum disulfide or greases.
WARNING! Remove any dust deposits from the coupling
components and the coupling elements in an appropriate way
for explosive environments.

10 © 2013, 2023 Regal Rexnord Corporation, All Rights Reserved. MCIM23014E • Form# CP3-001E
Table 4 — Cap ScrewTightening Torque
8. Disc Pack Replacement
If it becomes necessary to replace the disc packs, it can be done
as follows.
Note: The XTSR71 center member subassemblies have
their locknuts factory tightened. On center member
subassemblies where the spacer length is short and wrench
access is limited, special wrenches are used to tighten the
locknuts. Consult Regal Rexnord for assistance in obtaining
these special wrenches.
8.1 Remove the center member subassembly by removing all
cap screws from hubs to compress the center member
assembly by inserting them through the holes in the flanges
of the center spool and threading them into the adapter
tapped holes as shown in Figure 10 and dropping the center
member assembly out from between the hubs. There are
jacking screw tapped holes in each end hub to disengage
the pilots between the hubs and adapters, using the hub to
adapter cap screws as defined in Table 4.
XTSR71
Coupling
Size
“A” Dimension
Std. Hub
Flange Hex Head Cap Screw-Standard Hub
“A” Dimension
XL Hub
Flange Hex Head Cap Screw-XL Hub
Cap
Screw
Size
Torque Wrench
Size
(mm)
Cap
Screw
Size
Torque Wrench
Size
(mm)
(in) (mm) (mm) (ft-lb) (Nm) (in) (mm) (mm) (ft-lb) (Nm)
494 2.77 70.0 M5x20 6.3 8.5 8 3.36 85.0 M5x20 6.3 8.5 8
644 3.36 85.0 M5x20 6.3 8.5 8 --- --- --- --- --- ---
726 3.74 95.0 M6x20 12.3 16.7 10 4.25 108.0 M6x20 12.3 16.7 10
826 4.25 108.0 M6x20 12.3 16.7 10 5.08 129.0 M8x25 27 36 13
996 5.08 129.0 M8x25 27.0 36 13 5.51 140.0 M6x25 12.3 16.7 10
1088 5.51 140.0 M6x25 12.3 16.7 10 6.54 166.0 M8x30 27 36 13
1298 6.54 166.0 M8x30 27 36 13 7.83 199.0 M10x35 51.0 69 15
1548 7.83 199.0 M10x35 51 69 15 8.66 220.0 M10x40 51.0 69 15
1698 8.66 220.0 M10x40 51 69 15 9.66 245.4 M12x40 92.0 124 16
1928 9.66 245.4 M12x40 92 124 16 10.39 264.0 M12x40 92.0 124 16
2068 10.39 264.0 M12x40 92 124 16 11.44 290.5 M12x50 92.0 124 16
2278 11.44 290.5 M12x50 92 124 16 12.32 313.0 M14x50 142 193 18
2468 12.32 313.0 M14x50 142 193 18 13.58 345.0 M12x60 92.0 124 16
2698 13.58 345.0 M12x60 92 124 16 15.00 381.0 M14x70 142 193 18
2888 15.00 381.0 M14x70 142 193 18 15.94 405.0 M14x70 142 193 18
3058 15.94 405.0 M14x70 142 193 18 17.20 437.0 M16x70 218 295 21
3358 17.20 437.0 M16x70 218 295 21 18.98 482.0 M16x80 218 295 21
3668 18.98 482.0 M16x80 218 295 21 19.80 503.0 M16x80 218 295 21
3908 19.80 503.0 M16x80 218 295 21 20.83 529.0 M16x80 218 295 21
4178 20.83 529.0 M16x80 218 295 21 23.94 608.0 M20x90 427 579 27
4588 23.94 608.0 M20x90 427 579 27 25.51 648.0 M20x100 427 579 27
4918 25.51 648.0 M20x100 427 579 27 26.69 678.0 M20x110 427 579 27
5258 26.69 678.0 M20x110 427 579 27 --- --- --- --- --- ---
Note:
1. These torque values are approximate for cap screws with lubricated threads.
8.2 Remove all locknuts, bolts, bushings, and disc packs.
Special wrenches may be required. Clean the two adapters
and the center spool, removing any nicks and burrs. See
Figure 2. Install the new disc packs to the adapters first.
Note: Match marks (if applied at assembly balance) must be
in-line to maintain balance integrity.
8.3 Install the disc packs to the adapter first so that the washer
heads of the disc pack line up with the bolt holes in the
adapter as shown in Figure 11A. Insert the bolts through
the adapter bolt holes and disc pack.
8.4 Install an overload bushing onto each bolt, as shown on
Figure 11A and 11B.

11
© 2013, 2023 Regal Rexnord Corporation, All Rights Reserved. MCIM23014E • Form# CP3-001E
Unitized Disc Pack
Spacer Adapter
Bolt Overload Bushing
Locknut
Figure 11A
Unitized Disc Pack
Adapter Spacer
Overload Bushing
Locknut
Bolt
Figure 11B
8.5 Apply a clean motor oil to the bolt threads and install a
locknut on each bolt. Slightly tighten all locknuts using an
alternating progressive pattern as shown in Figures 13 and
14, making sure all the bolts are fully seated. At this stage
you will only be working with half of the bolts on the disc
pack. Now tighten each locknut to the appropriate torque
value shown in Table 5, using incremental torque in a
progressive alternating pattern as shown in Figures 13
and 14.
NOTICE All bolt threads must be lubricated prior to
assembly. A clean motor oil is recommended. Do not use
lubricants containing molybenum disulfide or greases.
8.6 Position center member against disc pack aligning the
clearance holes on the center member to the installed bolts
on the adapter to disc pack joint.
8.7 Insert all the remaining bolts through the center member
bolt holes and disc pack as shown in Figure 11B.
8.8 Install an overload bushing onto each bolt, as shown on
Figure 11A and 11B.
8.9 Apply a clean motor oil to the bolt threads and install a
locknut on each bolt.
8.10 Slightly tighten remaining locknuts using an alternating
progressive pattern as shown in Figures 13 and 14, making
sure the pack is not distorted and all the bolts are fully
seated. Now tighten each locknut to the appropriate torque
value shown in Table 5, using an incremental torque in a
progressive alternating pattern as shown in Figures 13
and 14.
8.11 Proceed to install the center member subassembly as
outlined in the Final Assembly section 8.
Note: When possible, it is recommended that all locknuts
have their tightening torque checked after several hours of
initial operation.
For spare replacement parts, see Table 1.

12
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Regal Rexnord, Rexnord and Thomas are trademarks of Regal Rexnord Corporation or one of its affiliated companies.
© 2013, 2023 Regal Rexnord Corporation, All Rights Reserved. MCIM23014E • Form# CP3-001E
Table 5 — Lock Nut TighteningTorque
XTSR71
Coupling Size
“A” Dimension Std. Hub Locknut
Bolt Size Torque Wrench Size
(mm)
(in) (mm) (mm) (ft-lb) (Nm)
494 2.77 70.0 M5 4.7 6.4 8
644 3.36 85.0 M5 4.7 6.4 8
726 3.74 95.0 M5 4.7 6.4 8
826 4.25 108.0 M6 8.1 11 11
996 5.08 129.0 M8 18 24 14
1088 5.51 140.0 M8 18 24 14
1298 6.54 166.0 M10 39 53 18
1548 7.83 199.0 M12 66 90 21
1698 8.66 220.0 M14 110 150 22
1928 9.66 245.4 M16 162 220 24
2068 10.39 264.0 M18 236 320 27
2278 11.44 290.5 M20 266 360 30
2468 12.32 313.0 M22 384 520 32
2698 13.58 345.0 M24 575 780 36
2888 15.00 381.0 M27 885 1200 41
3058 15.94 405.0 M27 885 1200 41
3358 17.20 437.0 M30 1200 1600 46
3668 18.98 482.0 M33 1500 2000 50
3908 19.80 503.0 M33 1500 2000 50
4178 20.83 529.0 M36 2100 2800 55
4588 23.94 608.0 M42 3200 4400 65
4918 25.51 648.0 M45 4100 5600 70
5258 26.69 678.0 M48 4900 6700 75
Notes:
1. These torque values are approximate for steel bolts with lubricated threads.
2. Bolts should be held from rotating while the locknuts are tightened to the values shown. Do not tighten the fastener by rotating the bolt head.
Figure 14
1
58
4 2
3
6
7
Figure 13
1 4
2
53
6